A unit of gas concentration given in parts per trillion. One PPT is 1 part in 1,000,000,000,000. One PPT thus represents a concentration of 1 one-thousandth of a cubic millimeter of gas in a cubic meter.
Parts per trillion. Units commonly used to express low concentrations of contaminants. For example, 1 ounce of trichloroethylene (TCE) in 1 million ounces of water is 1 ppm. 1 ounce of TCE in 1 trillion ounces of water is 1 ppt.
File extension that is associated with digital documents created in Microsoft PowerPoint. If you have or are given a file with this extension on it (for example, Presentation.ppt), it is likely the document was originally created in Microsoft PowerPoint.[[ | | | | | | | | | JK | | | | | | | | | | | | | XYZ